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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-6736

Authentication bypass vulnerability in GitHub Enterprise Server allowed creation of local user accounts bypassing the configured external identity provider

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Status
Published
Published
Updated
Assigning organization
GitHub_P

Description

An authentication bypass vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to create a local user account, bypassing the configured external identity provider. When external authentication was enabled, the signup endpoint did not properly enforce the authentication restriction, allowing account creation and session establishment without identity provider validation. The created account was limited to the default base permissions configured on the instance. Exploitation required network access to a GHES instance configured with an external authentication provider. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

GitHub Enterprise Server

Default version status: affected

  • 3.16.0 to ≤ 3.16.17affected
  • 3.17.0 to ≤ 3.17.14affected
  • 3.18.0 to ≤ 3.18.8affected
  • 3.19.0 to ≤ 3.19.5affected
  • 3.20.0 to ≤ 3.20.1affected

References